getting conditions to work

I'm trying to destroy an object from code behind in Silverlight/Farseer physics/Physics Helper 4/C#. (I posted a thread resembling this one in the Farseer forum but realised it was more geared towards PH.)

I wrote this code:
if (sprite1.Name.StartsWith("iObject") && sprite2.Name.StartsWith("eDestroy"))
{
if (Math.Abs(sprite1.BodyObject.AngularVelocity) > 15) //if a "real" hit, regardless of direction [I know this should really be a value derived from LinearVelocity, perhaps the hypothenuse using Pythagoras's theorem?]
{

World.DestroyBody(sprite2); //doesn't work because "FarseerPhysics.Dynamics.World does not contain a definition for DestroyBody."

All I'm trying to do is to get the explodebehaviour to fire, so that I get these little particles and the object disappears, but I don't know how to trigger this in code.

An alternative would be to do this in Blend, and just attach the ExplodeBehavior (and DestroyBehavior too?). However, I still want the object to explode only if the velocity of the first object is greater than a specified value. There is a Conditions list in
Blend, but I can't find the velocity values, only the values of the object. How would I write this is Blend, if at all possible?

The explode effect is really just a simple Storyboard animation. You could look at the user control, ucExplode, to get an idea of the animation. You could even use ucExplode as the effect programmatically - just set the Left, Top position of the control
and start the animation.

The explode effect is really just a simple Storyboard animation. You could look at the user control, ucExplode, to get an idea of the animation. You could even use ucExplode as the effect programmatically - just set the Left, Top position of the control
and start the animation.